International Shipping

We do not offer international shipping to countries within the European Union

We can only ship non-hazardous products to Rest of World

Bromothymol Blue sodium salt

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Price: £7.95

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Stock Availability

On Shelf - Approx. UK delivery date: Monday the 22nd September 2025*

In bulk stock - ships within 10 - 12 Working Days (Excluding weekends and public holidays)

4 to 6 weeks approx. (Not guaranteed)

UK Shipping

Unfortunately, we are not currently accepting orders for Northern Ireland.

We can only ship to the following postcodes where a Royal Mail postal option has been chosen at checkout.

AB, DD, DG3, DG4, DG6 - DG9, EH, FK, G, HS, IM, IV, KA, KW, KY, ML, PA, PH, PO30 - PO41, TD, TR21 - TR25, ZE

* We will always try to ship as early as possible. Delivery could be much quicker than stated but is not guaranteed

Applications

Biological Dye
pH Indicator
CO2 Indicator

General

Bromothymol blue (also known as bromothymol sulfone phthalein, and BTB) is a pH indicator for weak acids and bases. It is mostly used in applications that require measuring substances that would have a relatively neutral pH (near 7), such as managing the pH of pools and fish tanks.